Merge \"Ensuring we don\'t try and dismiss task views that are already removed.\" into nyc-dev

am: c169a9d8a1

Change-Id: I16e8679a30285ca9c1472022348861b759e1aed7

packages/SystemUI/src/com/android/systemui/recents/views/RecentsTransitionHelper.java

@@ -209,7 +209,9 @@ public class RecentsTransitionHelper {
             EventBus.getDefault().send(new LaunchTaskSucceededEvent(taskIndexFromFront));
         } else {
             // Dismiss the task if we fail to launch it
-            taskView.dismissTask();
+            if (taskView != null) {
+                taskView.dismissTask();
+            }
 
             // Keep track of failed launches
             EventBus.getDefault().send(new LaunchTaskFailedEvent());